Helical corrugated pipe connecting device with high sealing performance

Abstract

The utility model discloses a spiral corrugated pipe connecting device with high sealing performance. The spiral corrugated pipe connecting device comprises a tubular shell, an inner cavity pipe body and a double-end sealing assembly. The inner wall of the tubular shell is provided with a first internal thread matched with the external thread on the spiral corrugated pipe, and the inner cavity pipe body is coaxially fixed in the tubular shell through an annular connecting piece. The double-end sealing assemblies are symmetrically arranged at the two ends of the shell and comprise connecting parts and detachable sealing heads, the connecting parts are provided with annular sealing grooves where elastic sealing rings are embedded, and the inner walls of the sealing heads are provided with second internal threads. And the connecting part and the sealing head are fixed through a circumferential locking bolt, and an injection hole is formed, so that hot melt adhesive or anaerobic adhesive can be injected into the injection hole to form a secondary sealing layer. The device achieves double sealing through the synergistic effect of pressing of the elastic sealing ring and filling of the chemical sealant. Anti-vibration and structural strength are enhanced through the design of the lock washer and the annular reinforcing ribs; the inner cavity pipe body is matched with the inner diameter of the corrugated pipe in an equal-diameter mode, smooth flow channels are guaranteed, and sealing performance is enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline connection technology, specifically relating to a high-sealing spiral corrugated pipe connection device. Background Technology

[0002] Spiral corrugated pipes, as a type of pipe with flexibility, pressure resistance, and corrosion resistance, are widely used in petrochemical, natural gas transportation, urban water supply and drainage, and industrial fluid transmission fields. Their unique spiral corrugated structure allows them to adapt to a certain degree of bending deformation and external pressure; however, in practical applications, the sealing performance of the connection points remains a key factor limiting their reliability.

[0003] Traditional spiral bellows connection methods mainly include flange connection, threaded connection, or clamp connection. Among them, flange connection achieves sealing by tightening the gasket between the flanges with bolts, but the structure is bulky and the installation is complicated. In high-pressure or vibration environments, leakage is prone to occur due to gasket aging or bolt loosening. At the same time, there is a problem that the contact surface between the spiral groove on the outer wall of the spiral bellows and the connecting components is uneven. It is difficult to fill the spiral gap with a flat rubber gasket alone, which can easily form a leakage channel and result in poor connection sealing.

[0004] Therefore, how to mitigate or at least alleviate the aforementioned problems or defects by providing new or otherwise improved structures for spiral bellows connection devices is an urgent issue that needs to be addressed. Utility Model Content

[0005] In response to one or more of the above-mentioned defects or improvement needs of the existing technology, this utility model provides a high-sealing spiral bellows connection device with a synergistic sealing design of double-end sealing components. It combines the double protection of elastic sealing ring compression and injectable sealing material, which significantly improves sealing reliability and effectively copes with the sealing challenges brought about by high pressure, corrosive media or temperature fluctuations.

[0006] To achieve the above objectives, this utility model provides a high-sealing spiral bellows connection device, which includes:

[0007] A tubular shell has a first internal thread on its inner wall that matches the external thread on a spiral bellows pipe. An inner cavity tube is coaxially arranged inside the tubular shell, and the inner cavity tube is connected to the tubular shell by an annular connecting piece.

[0008] A double-ended sealing assembly is symmetrically arranged at both ends of the tubular shell, including a connecting part and a sealing head detachably connected to the connecting part. The connecting part has an annular sealing groove on the side facing the sealing head, and an elastic sealing ring is embedded in the annular sealing groove. The inner wall of the sealing head is provided with a second internal thread that matches the external thread on the spiral bellows.

[0009] The connecting part is provided with an injection hole that penetrates its wall thickness for injecting sealing material into the mating surface between the connecting part and the sealing head.

[0010] The connecting part and the sealing head have multiple threaded mounting holes spaced apart circumferentially on their mating end faces. Locking bolts are inserted into the threaded mounting holes, and the locking force of the locking bolts causes the sealing head to press against the elastic sealing ring.

[0011] As a preferred technical solution, the outer edge of the annular connecting piece is welded and fixed to the inner wall of the tubular shell, and the inner edge is welded and fixed to the outer wall of the inner cavity tube.

[0012] As a preferred technical solution, the threaded mounting holes correspond one-to-one with the connecting part and the sealing head, and each threaded mounting hole is provided with an anti-loosening washer.

[0013] As a preferred technical solution, a detachable sealing cap is provided at the outer end of the injection hole, and the injection hole and the sealing cap are connected by a threaded structure. The injection channel of the injection hole is a multi-outlet channel to ensure uniform filling of sealing material.

[0014] As a preferred technical solution, the outer diameter of the inner cavity tube is the same as the inner diameter of the spiral corrugated tube.

[0015] As a preferred technical solution, the sealing material is a hot-melt sealant and an anaerobic thread sealant, which, after curing, forms a filling layer that matches the inner wall of the injection hole, the mating surface of the connection and the sealing head, and the gap shape between the external thread and the first internal thread and the second internal thread.

[0016] As a preferred technical solution, the outer surface of the tubular shell is provided with annular reinforcing ribs, which are equidistantly distributed along the axial direction and integrally formed with the tubular shell.

[0017] In summary, the beneficial effects of the above-described technical solutions conceived by this utility model compared with the prior art include:

[0018] This utility model provides a high-sealing spiral bellows connection device, which improves the sealing performance of the spiral bellows connection device through integrated innovative structural design and multiple sealing mechanisms. The device adopts a synergistic sealing design of double-end sealing components, combined with the double protection of elastic sealing ring compression and injectable sealing material, which significantly improves sealing reliability and effectively copes with the sealing challenges caused by high pressure, corrosive media, or temperature fluctuations. In terms of structural design, the one-piece molded annular reinforcing ribs on the outer surface of the tubular shell enhance the overall pressure resistance and bending resistance, while the equal diameter matching design of the inner tube body and the spiral bellows ensures the smooth flow of the medium, reduces turbulence and energy loss, extends the service life of the sealing structure, and ensures long-term stable sealing pressure.

[0019] This utility model combines high sealing performance, strong environmental adaptability, and economic practicality, and can be widely used in petrochemical, natural gas transportation, municipal water supply and drainage and other fields. It is especially suitable for complex working conditions such as high pressure, high temperature, strong corrosion or frequent vibration, and provides a reliable technical solution for the efficient and safe connection of spiral corrugated pipes. Attached Figure Description

[0020] Figure 1 This is an exploded structural diagram of a high-sealing spiral bellows connection device according to the present invention;

[0021] Figure 2 This is a structural diagram of the connecting pipe of a high-sealing spiral corrugated pipe connecting device according to this utility model;

[0022] Figure 3 for Figure 2 Front sectional view;

[0023] Figure 4 for Figure 3 Enlarged view of section A in the middle;

[0024] Figure 5 This is a structural diagram of a high-sealing spiral bellows connection device according to the present invention.

[0025] Figure 6 for Figure 5 Front view sectional view.

[0026] The meanings of the markings in the attached diagram are as follows:

[0027] 100. Tubular shell; 110. First internal thread; 120. Annular reinforcing rib; 200. Helical bellows; 210. External thread; 300. Inner tube body; 310. Annular connecting piece; 400. Double-end sealing assembly; 410. Connecting part; 411. Annular sealing groove; 412. Elastic sealing ring; 413. Second internal thread; 414. Injection hole; 415. Threaded mounting hole; 416. Locking bolt; 417. Anti-loosening washer; 418. Sealing cap; 420. Sealing head. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0030] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0031] In the embodiments, by Figure 1-6 Give, Figure 1 This is an exploded structural diagram of a high-sealing spiral bellows connection device according to the present invention; Figure 2 This is a structural diagram of the connecting pipe of a high-sealing spiral corrugated pipe connecting device according to this utility model; Figure 3 for Figure 2 Front sectional view; Figure 4 for Figure 3 Enlarged view of section A in the middle; Figure 5 This is a structural diagram of a high-sealing spiral bellows connection device according to the present invention. Figure 6 for Figure 5 The main sectional view includes a tubular shell 100, the inner wall of which is provided with a first internal thread 110 that matches the external thread 210 on the spiral bellows 200. An inner cavity tube 300 is coaxially provided inside the tubular shell 100, and the inner cavity tube 300 is connected to the tubular shell 100 by an annular connecting piece 310.

[0032] The double-ended sealing assembly 400 is symmetrically arranged at both ends of the tubular housing 100, including a connecting part 410 and a sealing head 420 detachably connected to the connecting part 410. The connecting part 410 has an annular sealing groove 411 on the side facing the sealing head 420. An elastic sealing ring 412 is embedded in the annular sealing groove 411. The inner wall of the sealing head 420 is provided with a second internal thread 413 that matches the external thread 210 on the spiral bellows 200.

[0033] The connecting part 410 is provided with an injection hole 414 that penetrates its wall thickness, for injecting sealing material into the mating surface between the connecting part 410 and the sealing head 420.

[0034] The connecting part 410 and the sealing head 420 have a plurality of threaded mounting holes 415 spaced apart along the circumference on their mating end faces. Locking bolts 416 are inserted into the threaded mounting holes 415. The locking force of the locking bolts 416 causes the sealing head 420 to press the elastic sealing ring 412.

[0035] The outer edge of the annular connecting piece 310 is welded and fixed to the inner wall of the tubular shell 100, and the inner edge is welded and fixed to the outer wall of the inner cavity tube 300.

[0036] The threaded mounting holes 415 correspond one-to-one on the connecting part 410 and the sealing head 420. Each threaded mounting hole 415 is provided with an anti-loosening washer 417 to prevent vibration from causing the locking bolt 416 to loosen.

[0037] The injection hole 414 is provided with a detachable sealing cap 418 at its outer end. The injection hole 414 and the sealing cap 418 are connected by a threaded structure. The injection channel of the injection hole (414) is a multi-outlet channel to ensure uniform filling of sealing material.

[0038] The outer diameter of the inner cavity tube 300 is the same as the inner diameter of the spiral corrugated pipe 200. The inner wall of the spiral corrugated pipe (200) is tightly fitted with the outer wall of the inner cavity tube (300) to form a smooth medium flow channel and reduce flow resistance.

[0039] The sealing material is a hot melt sealant and an anaerobic thread sealant. After curing, it forms a filling layer that matches the inner wall of the injection hole 414, the mating surface of the connection part 410 and the sealing head 420, and the gap shape between the external thread 210 and the first internal thread 110 and the second internal thread 413, thereby enhancing the sealing performance of the connection device.

[0040] The outer surface of the tubular shell 100 is provided with annular reinforcing ribs 120. The annular reinforcing ribs 120 are equidistantly distributed along the axial direction and integrally formed with the tubular shell 100, thereby enhancing the overall pressure resistance and bending resistance.

[0041] The specific working process of this utility model:

[0042] First, the sealing head 420 is matched and assembled with the connecting part 410. Then, the ends of the two sections of spiral bellows 200 are inserted into the two ends of the tubular shell 100 in sequence. By rotating the spiral bellows, its external thread 210 engages simultaneously with the first internal thread 110 of the tubular shell 100 and the second internal thread 413 of the sealing head 420. During this process, the inner wall of the spiral bellows 200 is tightly fitted with the outer wall of the inner cavity tube 300, forming a smooth medium flow channel and reducing flow resistance. As the sealing head 420 is screwed in, it gradually presses the elastic sealing ring 412, forming a preliminary mechanical seal, until the spiral bellows 200 is screwed in completely.

[0043] After the spiral bellows 200 is screwed into place, the locking bolt 416 is inserted into the threaded mounting hole 415 of the connecting part 410 and the sealing head 420, and tightened to the preset torque. The clamping force of the locking bolt 416 causes the sealing head 420 to further compress the elastic sealing ring 412, eliminating the micro-gap of the threaded mating surface, ensuring that the sealing ring deforms uniformly and fills the space of the annular sealing groove 411. After tightening, the sealing cap 418 at the outer end of the injection hole 414 on the connecting part 410 is removed, and hot melt sealant or anaerobic thread sealant is injected through the injection hole 414 into the mating surface of the sealing head 420 and the connecting part 410, as well as the gap between the external thread 210 and the first internal thread 110 and the second internal thread 413 of the sealing head 420.

[0044] Use a special injection tool to inject the sealant into the gap under pressure until the filling layer completely covers the gap. After the sealant has cured, such as hot melt adhesive cooling or anaerobic adhesive oxidizing and curing, tighten the sealing cap 418 again to prevent external impurities from entering. At this time, the two sections of spiral corrugated pipe are connected by the connecting device.

[0045] In summary, this utility model provides a high-sealing spiral bellows connection device that improves the sealing performance of the spiral bellows connection device through integrated and innovative structural design and multiple sealing mechanisms. The device employs a synergistic sealing design with double-end sealing components, combining elastic sealing ring compression and injectable sealing material for dual protection, significantly improving sealing reliability and effectively addressing sealing challenges posed by high pressure, corrosive media, or temperature fluctuations. Structurally, the integrally formed annular reinforcing ribs on the outer surface of the tubular shell enhance overall pressure and bending resistance, while the equal-diameter matching design between the inner tube and the spiral bellows ensures smooth media flow, reduces turbulence and energy loss, extends the lifespan of the sealing structure, and ensures long-term stable sealing pressure. This utility model combines high sealing performance, strong environmental adaptability, and economic practicality, and can be widely applied in petrochemical, natural gas transportation, and municipal water supply and drainage fields. It is particularly suitable for complex working conditions involving high pressure, high temperature, strong corrosion, or frequent vibration, providing a reliable technical solution for the efficient and safe connection of spiral bellows.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-sealability spiral corrugated pipe coupling device, characterized by, The utility model relates to a kind of double-end sealing assemblies, including: Tubular shell (100), the inner wall of which is provided with the first internal thread (110) matched with the outer thread (210) on spiral bellows (200), the inner cavity pipe body (300) is coaxially arranged inside the tubular shell (100), and the inner cavity pipe body (300) is connected between the tubular shell (100) by annular connecting sheet (310); Double-end sealing assembly (400), symmetrically arranged at both ends of the tubular shell (100), including connecting portion (410) and sealing head (420) detachably connected with the connecting portion (410), the side of the connecting portion (410) towards sealing head (420) is provided with annular sealing groove (411), and the annular sealing groove (411) is embedded with elastic sealing ring (412), and the inner wall of the sealing head (420) is provided with the second internal thread (413) matched with the outer thread (210) on spiral bellows (200); Wherein, the connecting portion (410) is provided with injection hole (414) penetrating its wall thickness, for injecting sealing material to the joint surface of connecting portion (410) and sealing head (420); The abutting end surface of the connecting portion (410) and the sealing head (420) is provided with a plurality of threaded mounting holes (415) spaced apart in the circumferential direction, a locking bolt (416) is arranged in the threaded mounting hole (415), and the locking force of the locking bolt (416) makes the sealing head (420) press the elastic sealing ring (412).

2. A high containment bellows coupling device as claimed in claim 1, wherein: The outer edge of the annular connecting sheet (310) is welded and fixed with the inner wall of the tubular shell (100), and the inner edge is welded and fixed with the outer wall of the inner cavity pipe body (300).

3. A high containment bellows coupling device as claimed in claim 1, wherein: The threaded mounting hole (415) corresponds one by one on the connecting portion (410) and the sealing head (420), and each threaded mounting hole (415) is provided with a lock washer (417).

4. A high containment bellows coupling device as claimed in claim 1, wherein: The outer end of the injection hole (414) is provided with a detachable sealing cover (418), and the injection hole (414) and the sealing cover (418) are connected by a threaded structure, and the injection channel of the injection hole (414) is a multi-outlet channel to uniformly fill the sealing material.

5. A high containment bellows coupling device as claimed in claim 1, wherein: The outer diameter of the inner cavity pipe body (300) is the same as the inner diameter of the spiral bellows (200).

6. A high containment bellows coupling device as claimed in claim 1, wherein: The sealing material is a hot-melt sealant and an anaerobic thread sealant, which forms a filling layer matched with the inner wall of the injection hole (414), the joint surface of the connecting portion (410) and the sealing head (420), and the gap shape between the outer thread (210) and the first internal thread (110) and the second internal thread (413) after curing.

7. A high containment bellows coupling device as claimed in claim 1, wherein: The outer surface of the tubular shell (100) is provided with annular reinforcing ribs (120), which are equidistantly distributed along the axial direction and are integrally formed with the tubular shell (100).

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